DeepSeek V3.1 (Fireworks) vs Inception Mercury 2 (OpenRouter): API Cost Comparison
Compare the API pricing, context windows, features, and real-world cost projections for DeepSeek V3.1 (Fireworks) (Fireworks AI) and Inception Mercury 2 (OpenRouter) (OpenRouter). Use the interactive calculator below to compute your exact monthly cost based on your token usage and request volume.
Prices verified Mar 10, 2026
Interactive Cost Calculator
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Showing costs for 2 models. Cheapest: Inception Mercury 2 (OpenRouter) at $6.25/month.
| Alert | |||||||
|---|---|---|---|---|---|---|---|
BestInception Mercury 2 (OpenRouter) | OpenRouter | $6.25 | $0.000625 | $2.50 | $3.75 | 55.4% | Alerts coming soon |
DeepSeek V3.1 (Fireworks) | Fireworks AI | $14.00 | $0.001400 | $5.60 | $8.40 | — | Alerts coming soon |
Monthly Cost Comparison
Price Comparison at a Glance
All prices are in USD per 1 million tokens ($/M tokens). Lower is cheaper.
| Pricing Type | DeepSeek V3.1 (Fireworks) | Inception Mercury 2 (OpenRouter) | Cheaper |
|---|---|---|---|
| Input (standard) | $0.56/M | $0.25/M | Inception Mercury 2 (OpenRouter) |
| Output | $1.68/M | $0.75/M | Inception Mercury 2 (OpenRouter) |
| Cached input | $0.28/M | N/A | — |
| Batch input | $0.28/M | N/A | — |
| Batch output | $0.84/M | N/A | — |
Prices last verified: 2026-03-10
Cost Breakdown by Usage Volume
Estimated monthly costs at different request volumes, assuming 1,000 input tokens and 500 output tokens per request. Adjust in the calculator above for your specific use case.
| Volume | DeepSeek V3.1 (Fireworks)Monthly | Inception Mercury 2 (OpenRouter)Monthly | DeepSeek V3.1 (Fireworks)Per request | Inception Mercury 2 (OpenRouter)Per request |
|---|---|---|---|---|
| 1K requests/mo | $1.40 | $0.62 | $0.001400 | $0.000625 |
| 10K requests/mo | $14.00 | $6.25 | $0.001400 | $0.000625 |
| 100K requests/mo | $140.00 | $62.50 | $0.001400 | $0.000625 |
| 1M requests/mo | $1,400.00 | $625.00 | $0.001400 | $0.000625 |
Green values indicate the lower-cost option at each volume tier. Cost per request is calculated at 1,000 input + 500 output tokens using standard (non-batch, non-cached) pricing.
Price History
Input price per 1M tokensWhen to Choose DeepSeek V3.1 (Fireworks)
by Fireworks AI
- Code generation
- Document summarization
- RAG / Semantic search
Input / 1M tokens
$0.56/M
Output / 1M tokens
$1.68/M
Context window
163,840
Tier
mid
When to Choose Inception Mercury 2 (OpenRouter)
by OpenRouter
- Document summarization
- General chatbot
Input / 1M tokens
$0.25/M
Output / 1M tokens
$0.75/M
Context window
128,000
Tier
budget
Key Differences Beyond Price
Cost is only one factor in choosing an AI model. Context window size, rate limits, supported features, and latency all affect whether a model fits your use case.
| Capability | DeepSeek V3.1 (Fireworks) | Inception Mercury 2 (OpenRouter) |
|---|---|---|
| Context window | 163,840 tokens | 128,000 tokens |
| Max output tokens | 16,384 tokens | 50,000 tokens |
| Performance tier | Mid | Budget |
| Vision / image input | No | No |
| Function calling | Yes | No |
| JSON mode | Yes | No |
| Prompt caching | Yes | No |
| Batch API (50% discount) | Yes | No |
| Extended reasoning | No | No |
| Fine-tuning | No | No |
DeepSeek V3.1 (Fireworks) notes
Fireworks serverless pricing. Cached input 50% discount. Batch inference at 50% of serverless rates.
Inception Mercury 2 (OpenRouter) notes
OpenRouter offers 200+ models — showing top 15 unique models not available from other listed providers. Prices include OpenRouter markup.
Frequently Asked Questions
Is DeepSeek V3.1 (Fireworks) cheaper than Inception Mercury 2 (OpenRouter)?
At standard usage (1,000 input tokens, 500 output tokens, 100,000 requests/month), Inception Mercury 2 (OpenRouter) costs $62.50/month versus $140.00/month for DeepSeek V3.1 (Fireworks) — a 55% saving. Your actual savings will vary based on your token profile; output-heavy workloads amplify differences in output pricing.
Which model has a larger context window, DeepSeek V3.1 (Fireworks) or Inception Mercury 2 (OpenRouter)?
DeepSeek V3.1 (Fireworks) has a larger context window at 163,840 tokens, compared to 128,000 tokens for Inception Mercury 2 (OpenRouter). A larger context window is important for processing long documents, multi-turn conversations, or large codebases without truncation.
Do DeepSeek V3.1 (Fireworks) and Inception Mercury 2 (OpenRouter) support the Batch API?
DeepSeek V3.1 (Fireworks) supports the Batch API (50% discount for async processing), while Inception Mercury 2 (OpenRouter) does not. If your workload tolerates up to 24-hour latency, routing to DeepSeek V3.1 (Fireworks) with batch pricing could significantly cut costs versus Inception Mercury 2 (OpenRouter)'s standard rate.
Which model offers better prompt caching?
DeepSeek V3.1 (Fireworks) supports prompt caching at $0.28/M for cached input, while Inception Mercury 2 (OpenRouter) does not offer prompt caching. For RAG applications or chatbots with large, repeated context, DeepSeek V3.1 (Fireworks)'s caching capability can substantially reduce effective costs.
What are the best use cases for DeepSeek V3.1 (Fireworks) vs Inception Mercury 2 (OpenRouter)?
Both models are well-suited for Document summarization. DeepSeek V3.1 (Fireworks) is particularly strong for Code generation, RAG / Semantic search. Inception Mercury 2 (OpenRouter) is favored for General chatbot. At the same quality level, the lower-cost model is usually preferable; use this page's calculator to compare total monthly spend at your volume.
What is the cost per request for DeepSeek V3.1 (Fireworks) vs Inception Mercury 2 (OpenRouter)?
At 1,000 input tokens and 500 output tokens per request — a typical conversational workload — DeepSeek V3.1 (Fireworks) costs $0.001400 per request and Inception Mercury 2 (OpenRouter) costs $0.000625 per request. At 100,000 requests/month, that translates to $140.00 and $62.50 respectively. Use the interactive calculator to adjust these parameters for your actual workload.
DeepSeek V3.1 (Fireworks) vs Inception Mercury 2 (OpenRouter): Summary
When comparing DeepSeek V3.1 (Fireworks) and Inception Mercury 2 (OpenRouter) for API cost, the right choice depends on your workload's token profile, required features, and tolerance for latency. Inception Mercury 2 (OpenRouter) offers lower total cost at standard usage volumes (1,000 input + 500 output tokens per request at 100,000 requests/month) at $62.50/month, compared to $140.00/month for DeepSeek V3.1 (Fireworks).
Both models are priced in USD per million tokens, the standard unit across all major AI API providers. DeepSeek V3.1 (Fireworks) charges $0.56/M for input tokens and $1.68/M for output tokens. Inception Mercury 2 (OpenRouter) charges $0.25/M input and $0.75/M output. If your workload is output-heavy (more tokens generated than consumed as input), the model with the lower output price compounds cost savings significantly at scale.
Prompt caching is supported by DeepSeek V3.1 (Fireworks) but not Inception Mercury 2 (OpenRouter). For workloads with large, repeated system prompts or document context — such as RAG pipelines or multi-turn conversations with a fixed knowledge base — prompt caching can reduce effective input costs by 60–90%, which may change the cost ranking between these two models at your specific usage pattern.
Context window capacity differs between the two: DeepSeek V3.1 (Fireworks) supports up to 163,840 tokens in a single request, versus 128,000 tokens for Inception Mercury 2 (OpenRouter). A larger context window is essential for document summarization, large codebase analysis, and multi-document retrieval-augmented generation (RAG) applications.
Use the interactive calculator at the top of this page to enter your actual token usage and monthly request volume for a precise cost comparison tailored to your workload. Adjust for batch API discounts and prompt caching to find the most cost-effective option for your specific deployment.
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Relevant Use Cases
See cost recommendations for workloads where DeepSeek V3.1 (Fireworks) or Inception Mercury 2 (OpenRouter) is recommended.